HSST Computer Science / Application 2012:Possible Answer Key : Q.No 1 to Q.No 25

1.A document preparation software
(A) FOXPRO  (B) ORACLE (C) LATEX  (D) MATLAB
Ref : http://en.wikipedia.org/wiki/LaTeX


2.A technique in which system resources are shared among multiple users:
(A) Multiplexing (B) Demultiplexing (C) Modulation (D) Demodulation


3. Interaction modelling cannot be done using:
(A) State Diagrams  (B) Use - Cases
(C) Sequence Diagrams (D) Activity Diagrams


4.The number of bits that can be transmitted over a networ in a certain period 0/ ime.
(A) Latency (B) Delay (C) Bandwidth (D) Baud
Note : baud is right (bits / sec => bits/unit time,

bandwidth = range frequencies in a band

5. Which of these is not a mark up language?
(A) HTML (B) XML (C) SGML (D) XGML
Note:XGML. => no such language

6. A network topology that combines features of linear- bus and star topology :
(A) Mesh (B) Ring (C)Tree (D) Cube


7.If language L={O,l}*, then the reversed language L^ R  =
(A) {O, 1}* (B) {} (C) {O}* (D) {1}*
{0,1}*  as it can give 01011 and also 11010

8.In Linux, the subdirectory that contains system configuration files including user
passwords:
(A) /boot (B) /usr (C) /etc  (D) /proc


9.SQL command to delete a column from an existing table:
(A) Alter table (B) Drop table (C) Delete table (D) Delete column


10.A technique not associated with data mining:
(A) Predictive Modeling (B) Link Analysis
(C) Database Segmentation (D) Dimensionality Modeling
Note : Database segmentation. IT cannot be dimensioanlity modelling as it is connected with data mining and data warehousing. Dimensional Modeling refers to the technique used to design logical models for database which can support OLAP and Data Warehousing


11. Memory bank experiencing too much contention from processor:
(A) Fan -in (B) Hot-spot (C) Thrash (D) Fan-out
thrashing => excessive hitting with no progress

12.The number of nodes in a complete binary tree of height n :
(A) 2^(n-1)_1 (B) 2^(n-1)+1 (C) 2^(n+1)_1 (D) 2^(n+1) +1


13.The science and art of breaking ciphers.
(A) Cryptography  (B) Steganography (C) Cryptanalysis  (D) Steganalyis
Ref :http://en.wikipedia.org/wiki/Cryptanalysis


14. A raster scan display system with 24 bits per pixel and a screen resolution of 1024xl024 requires a frame buffer of size. 
(A) 1 Mega Bytes (B) 3 Mega Bytes (C) 8 Mega Bytes (D) 24 Mega Bytes 
Note : 24 megabyes => 1024x1024 => that much number of pixels and each pixel takes 24 bits => 1024x1024x24 = total number of bits => divided by 1024 = kbs again divided by 1024 = mbs => answer is 24. its not 3 .

15.Not a parallel programming language. 
(A) C· (B) SEQUENT C (C) nCube C (D) C+ + 



16. Process of mapping a network interface IP address to its hardware address: 
(A) ARP (B) RARP (C) ICMP (D)IGMP 
ARP => IP to MAC

17. For the following sample database table staff : 

Staff no Name Designa tion Branch Salary   
SL21 John Assistant B003 30000   
SG37 Ann Supervisor B007 42000   
SL25 Julie Assistant B007 32000   
SL52 Susan Manager BQ03 51000   
SG10 David Manager B004 47000  
the SQL query : SELECT COUNT (Staff no) AS mycount, SUM (Salary) AS mysum 
FROM Staff  WHERE Designation = 'Manager'      returns the result 

(A) mycount = 2, mysal = 47000 
(B) mycouht = 2, mysal = 98000  ( correction :  its not mysal its mysum )
(C) mycount = 5, mysal = 47000 
(D) mycount = 5, mysal = 98000 



18.Linux partitions are created using the file system: 
(A) FAT (B) FAT32 (C) EXT3 (D) NTFS


19. The local area network technology used in Ethernet 
(A) CSMA (B) CSMA/CD (C) CSMA/CA  (D) ALOHA
 

20. Data abstraction means : 
(A) Objects of one class acquire properties of object of another class 
(B) Insulation of data from direct access by programs 
(C) Code associated with a procedure call is not known until run time 
(D)Putting together essential features without including background details 



21.A hardware interface that allows for the connection of several peripheral devices to a single 
PCI board. 
(A) SCSI 
(B)SATA 
(C) ATA 
(D) PCI 
PCI => Peripjeral computer interface = onboard ports to connect multiple devices


22.If n represents the dimension of cube and k, the radix (no. of nodes along each dimensions) 
then the number of nodes N of a k-ary n-cube network is : 
(A) N=n^k (B) N=logkn (C) N=lognk (D) N=k^n 


23. The output generated by the following C program: 
# include < stdio.h> 
main 0 
int v=3; 
int * pv; 
pv = & v; 
* pv = 0; 
printf (" * pv = %d v= %d ", * pv, v); 
} 
(A) *pv = 0 v= 0 
(C) *pv = 3 v= 3 
(B) *pv = 0 v= 3 
(D) *pv = 3 v= a 


24.A famous technique used in data warehousing: 
(A) OODM (B) OLTP (C) OLAP (D) ODBC 


25. The environment variable in Linux, that contain a list of directories the shell automatically 
recognizes. 
(A) $ PATH 
(B) $ ENV 
(C) $ USER 
(D) $ GREP 



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